BLFS profile group/user checking

Kevin P. Fleming kpfleming at
Fri May 21 11:57:00 PDT 2004

The sections of the profiles that add groups and users use grep to check 
/etc/group and /etc/passwd to check if the groups and users to be added 
already exist.

However, the profiles are not using "grep -q", but instead are 
redirecting the output of grep to /dev/null. "grep -q" is much cleaner.

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